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Light-emitting device, display apparatus, and electronic system

A technology for light-emitting elements and display devices, which can be applied to electrical components, circuits, and electrical solid-state devices, etc., and can solve problems such as insufficient luminous efficiency.

Active Publication Date: 2014-02-12
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the light-emitting element disclosed in Patent Document 1, the luminous efficiency is not sufficient because the intermediate layer simply uses a general hole-transporting material or an electron-transporting material.

Method used

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  • Light-emitting device, display apparatus, and electronic system
  • Light-emitting device, display apparatus, and electronic system
  • Light-emitting device, display apparatus, and electronic system

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no. 1 Embodiment approach

[0099] figure 1 It is a diagram schematically showing a longitudinal section of a first embodiment of the light-emitting element of the present invention. It should be noted that, for the convenience of explanation, the following figure 1 In the description, the upper side is "upper" and the lower side is "lower".

[0100] figure 1 The light-emitting element (electroluminescent element) 1 shown is a light-emitting element that emits white light by emitting light of R (red), G (green), and B (blue).

[0101] Such a light-emitting element 1 is formed by laminating an anode 3, a hole injection layer 4, a hole transport layer 5, a red light-emitting layer (first light-emitting layer) 6, an intermediate layer 7, and a blue light-emitting layer (second light-emitting layer) in the following order. ) 8, green light-emitting layer (third light-emitting layer) 9, electron transport layer 10, electron injection layer 11 and cathode 12.

[0102] In other words, the light-emitting ele...

no. 2 Embodiment approach

[0230] figure 2 It is a diagram schematically showing a longitudinal section of a second embodiment of the light-emitting element of the present invention. It should be noted that, for the convenience of explanation, the following figure 2 In the description, the upper side is "upper" and the lower side is "lower".

[0231] figure 2 The light-emitting element (electroluminescent element) 1A shown is a light-emitting element that emits white light by emitting light of R (red), G (green), and B (blue).

[0232] In such a light-emitting element 1A, an anode 3A, a hole injection layer 4A, a hole transport layer 5A, a red light-emitting layer (first light-emitting layer) 6A, an intermediate layer 7A, a blue light-emitting layer (second light-emitting layer) are laminated in the following order. ) 8A, green light emitting layer (third light emitting layer) 9A, electron transport layer 10A, electron injection layer 11A and cathode 12A.

[0233] In other words, the light-emitti...

Embodiment 1

[0430] First, a transparent glass substrate having an average thickness of 0.5 mm was prepared. Then, an ITO electrode (anode) having an average thickness of 50 nm was formed on the substrate by a sputtering method.

[0431] Then, the substrate was immersed in acetone and 2-propanol in this order, and after ultrasonic cleaning, oxygen plasma treatment was performed.

[0432] Next, LG101 (manufactured by LG Chemical) was vapor-deposited on the ITO electrode by a vacuum deposition method to form a hole injection layer with an average thickness of 30 nm.

[0433] Then, the N,N'-bis(1-naphthyl)-N,N'-diphenyl[1,1'-biphenyl]-4 shown in the above chemical formula 6 was made by vacuum evaporation method, 4'-diamine (α-NPD) was evaporated on the hole injection layer to form a hole transport layer with an average thickness of 20 nm.

[0434] Next, the constituent materials of the red light-emitting layer were vapor-deposited on the hole transport layer by a vacuum evaporation meth...

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Abstract

The present invention provides a light-emitting device with excellent light emitting efficiency. A light-emitting device includes a cathode, an anode, a red light-emitting layer that is disposed between the cathode and the anode, a blue light-emitting layer that is disposed between the first light-emitting layer and the cathode, and an intermediate layer that is disposed between and in contact with the red light-emitting layer and the blue light-emitting layer and that contains a first material and a second material different from the first material. The red light-emitting layer has a first light emitting material and a first main body material; the HOMO energy levels of the first material, the second material and the first main body material are set to be HLA [eV], HLB [eV], and HLC [eV], satisfying the following two formulas.

Description

technical field [0001] The present invention relates to a light-emitting element, a display device, and electronic equipment. Background technique [0002] An organic electroluminescence element (so-called organic EL element) is a light-emitting element having a structure in which at least one light-emitting organic layer is interposed between an anode and a cathode. In such a light-emitting element, by applying an electric field between the cathode and the anode, electrons are injected from the cathode side into the light-emitting layer, and holes are injected into the light-emitting layer from the anode side, and electrons and holes are recombined in the light-emitting layer to generate An exciton, when the exciton returns to the ground state, part of its energy is released as light. [0003] As such a light-emitting element, for example, a light-emitting element in which two light-emitting layers corresponding to two colors R (red) and B (blue) are laminated between a ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56H01L27/32
Inventor 三矢将之
Owner SEIKO EPSON CORP
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